Propeller governor



PROPELLER GOVERNOR Filed May 9, 1958 1 VENTOR. MW!

Patented May 9, 1939 UNITED STATES PATENT OFFICE Claims.

This invention relates to propeller governors and is deemed animprovement over my former application Serial No. 160,866, now PatentNo. 2,116,849, issued May 10, 1938, and which in actual practice isfound to be more eflicient, and to produce such a device is theprincipal object of the invention.

Other objects and advantages of the invention will appear in thefollowing description thereof.

Referring now to the accompanying drawing forming part of thisapplication and wherein like reference characters indicate like parts:

Figure 1 is a plan view of a two-blade propeller 16 attachment with oneblade of a propeller shown as applied thereto.

Figure 2 is a section on the line 2-4, Figure 1.

Figure 3 is a plan view of a modified embodiment of the invention.

In Figures 1 and 2 of the drawing I represents a relatively thin metalplate adapted for use upon a two blade propeller, one of which blades isillustrated at 2 showing the attachment as applied thereto.

26 It will be noted that in this embodiment the opposite sides of theplate I are cut-away, forming substantially sector shaped remainingportions for registration with the blades of the propeller, and uponwhich portions the attachments applied to each blade is installed. Theseattachments embody the integrally formed arcuately shaped ear or lug 3adjacent one edge of each sector, while adjacent the opposite edge isalso an upstanding integral guide 4 for support of the spring clip 5,

which is held in position by a suitable bolt 6 extending through theelongated slot I adjacent the guide 4, this slot and bolt arrangementbeing for the convenient longitudinal adjustment of the clip to suitvarying dimensions of propeller blades.

Extending about the circumferential marginal edge of each sector of theplate I and stepped at right angles thereto is the upstanding wall 8which terminates in a fiat outwardly extending arcuately shaped inclinedblade rest or shelf indicated at 9 and upon which the blade of thepropeller when the device is applied to same will snugly rest or fit,thus forming a sort of pocket in the space beneath the propeller bladeand between it and the plate I. This pocket has been 0 found to functionadmirably in slowing down the rotation of the propeller blade and thusreducing its functioning as a propeller, and which is the paramountobject of the device.

While I have shown this embodiment as one applicable to a two-bladepropeller and having its opposite sides cut-away so as not toexcessively retard centrifugal action of the propeller, it is obviousthat the device may be applied to a three ora four blade propeller, inwhich event the cutaway portion may be modified as desired without 5departing from the spirit of the invention. In the present embodiment Ihave shown the hollow hub-like portion III upon the device, but the sameis not material to the functioning of the invention, and also thecentral portion of the plate may 10 be provided with a. circular openingonly, as illustrated at I I, and of any desired dimension.

The spring clips 5 do not differ materially from that shown in my abovementioned patent, and, as is apparent, for convenient snapping engagellment over the edge of the propeller blade, as clearly shown in Figure 2,they are made of suitable spring metal material and provided with theloop I2 for such overlapping engagement.

In Figure 3 is shown a modified form of pockgo eting wall for attachmentto any desired form of plate, illustrated at l3, and which plate isshown as provided with a lug I4 similar to the lugs 3, previouslydescribed, and these pocketing members or ear-like lugs as shown at I5have their 25 base portions extended somewhat and provided with astraight edge terminus as at I6 to act as a guide and support for thespring clips 5, which are identical with those shown in the otherfigures of the drawing and installed upon the plate I3 in 30 exactly thesame relation to the lug I4 as those illustrated in the other figures ofthe drawing. The removable ear I5 has the upstanding form andrelationship to the plate and clip, substantially identical to thatshown in the other figures of the 35 drawing, its flat inclined arcuatesurface ll being for engagement with the propeller blade when appliedthereto.

Having thus described my invention what I claim and desire to secure byLetters Patent, is: n

1. A speed governor for screw propellers comprising in combination aplate, means carried by said plate for removable engagement with theedges of the blades of said propeller, a stepped arcuately shaped bladerest extending outwardly 45 from the face of and beyond the periphery ofsaid plate.

2. A speed governor for screw propellers comprising in combination aplate, means carried by said plate for removable engagement with the 50edges of the blades of said propeller, and arcuate- 1y shaped inclinedblade rests extending outwardly from the face of the plate and beyondthe periphery thereof for reducing the speed of said propeller.

beyond the periphery of said plate for contact with the outer portion ofthe face of said propeller blades.

5. A speed governor for screw propellers comprising in combination aplate, means carried by said plate for removable engagement with theedges of the blades of said propeller, and arcuate- 1y shaped inclinedblade rests extending outwardly from the face of and beyond theperiphery of said plates and in a different plane therefrom.

MICHAEL WILLIAM ROSNER.

